Rockwell Automation 7000A PowerFlex Medium Voltage AC Drive - Air-Cooled (A Frame) - Manual (Page 223)

Commissioning 4-69
7000 “A” Frame 7000A-RM001A-EN-P – January 2011
Tuning
abort - indicates that the deviation in motor speed was
greater than 10 Hz. The measured inertia value is invalid.
Parameter Autotune Trq Stp must be set to a lower value and the
test repeated.
Inertia high - indicates that the measured total inertia is greater
than 20 seconds. This warning is intended to draw attention to
an unusually high inertia value. For a very high inertia load such
as a large fan, this may be a valid result and parameter Total
Inertia should be manually set equal to Autotune Inertia.
However, a high inertia measurement could also be produced by
a value of Autotune Trq Stp which is too low.
Flux Regulator Manual Tuning [Induction Motor]
1. Adjust the reference command to a value between 20 and 30 Hz.
2. Start the drive and wait for it to accelerate to the commanded speed.
3. Record the value of parameter Lm Measured (134) in Motor
Model.
4. Stop the drive.
5. Set parameter Lm Rated in Motor Model to the recorded value of
Lm Measured.
6. Calculate an approximate value of the rotor time constant using
the following formula:
Slip Rated
LmRated
T rotor
=
Where
RPM Sync
RPM Rated RPM Sync
Freqmotor Slip Rated
) (
) 2 (
−
× = π
Set the parameter T Rotor in Motor Model to the calculated value.